Databases
StackOverflow2013
Postsdbo
POError in cascading combobox in windows form in vb.net
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POError in cascading combobox in windows form in vb.net
    primarykey
    data
    text
    <p>I am Getting error like FormateException was unhandled by usercode. Error String is not in a correct format. can't solve this error. Any Suggestion ? ?</p> <p>I am getting Error In this Line</p> <pre><code>Dim stateid As Integer = Convert.ToInt32(cmbState.SelectedValue.ToString()) </code></pre> <p>Here's my full code</p> <pre><code> Public Class Form1 Private Sub FillState() Dim cn As SqlConnection = New SqlConnection("Data Source=192.168.0.7;Initial Catalog=TraineeDataBaseExamples;Persist Security Info=True;User ID=newtrainee;Password=newtrainee") cn.Open() Dim da As SqlDataAdapter = New SqlDataAdapter(" select * from KaiyumVbState ", cn) Dim ds As New DataSet da.Fill(ds) With cmbState .DataSource = ds.Tables(0) .DisplayMember = "StateName" .ValueMember = "StateID" .SelectedIndex = -1 End With End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load FillState() End Sub Private Sub cmbState_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbState.SelectedIndexChanged If cmbState.SelectedValue.ToString() &lt;&gt; "" Then Dim stateid As Integer = Convert.ToInt32(cmbState.SelectedValue.ToString()) FillCities(stateid) cmbCity.SelectedIndex = -1 End If End Sub Private Sub FillCities(ByVal stateid As Integer) Dim cn As SqlConnection = New SqlConnection("Data Source=192.168.0.7;Initial Catalog=TraineeDataBaseExamples;Persist Security Info=True;User ID=newtrainee;Password=newtrainee") Dim cmd As SqlCommand = New SqlCommand("select CityId,CityName from KaiyumVbCity where StateID = @Stateid ", cn) cmd.Parameters.AddWithValue("@StateId", stateid) Dim da As New SqlDataAdapter() da.SelectCommand = cmd Dim ds As New DataSet() cn.Open() da.Fill(ds) If ds.Tables(0).Rows.Count &gt; 0 Then With cmbCity .DataSource = ds.Tables(0) .DisplayMember = "CityName" .ValueMember = "CityId" End With End If End Sub Private Sub cmbState_AfterUpdate() End Sub End Class </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USkkk
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. COAre you sure that the StateID column contains only numeric (integer) values? If you set a breakpoint on the failing line, what is the value of SelectedValue property? –
      singulars
      1. POError in cascading combobox in windows form in vb.net
      1. USSteve
    2. COsolved by this. solved by this. If Integer.TryParse(cmbState.SelectedValue.ToString(), stateid) Then FillCities(stateid) End If
      singulars
      1. POError in cascading combobox in windows form in vb.net
      1. USkkk
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload